Wabco 8971806202 Cup Seal

Description

The Wabco 8971806202 Cup Seal is a critical component within air brake systems, specifically designed for trailer brake controls. This seal ensures proper air pressure maintenance and prevents leaks, contributing to reliable and efficient braking performance. Measuring 25 x 134 x 130 mm, this OE specification component delivers enhanced durability and consistent sealing, optimizing brake system longevity and safety.

Key Features & Benefits

These little rubber seals – and they are rubber, usually a pretty durable synthetic – basically keep the air pressure where it needs to be inside the brake chamber. They slide up and down with the piston as you apply and release the brakes. They’re designed to create a tight seal, preventing air leaks. Think of it like a piston in an engine, needing a good seal to build pressure. They’re part of the air brake system on your trailer – so they directly control how well your trailer stops. Each brake chamber has one or more of these, and they work with the diaphragm to push the brake shoes out against the drum, actually doing the stopping. They translate air pressure into mechanical force. Without good seals, the air just bleeds off, and you lose braking power.

Symptoms, Risks & Replacements

If these start to wear or crack, you'll notice if your brakes are taking longer to engage, or maybe they aren’t holding as firmly as they used to. You might even hear a hissing sound as air leaks past them. They aren’t something you want to ignore. A failing cup seal acts like a shield with holes in it – it’s still trying to hold pressure, but it’s not doing a great job. It can lead to reduced braking efficiency and, eventually, complete brake failure on that wheel. You can find them readily available, even online at places like Fixparts Online, but it's always a good idea to replace them in pairs, or even all the seals in a chamber, to ensure even performance.

Warranty Information

Wabco Cup Seal (MPN 8971806202) comes with a 1-year warranty.